Lennox Thermostat Programming Instructions

Open the door on the side of the thermostat if your thermostat is not touch-screen.

Press the "Day/Time" button to set the current day and time. Use the "Up" and "Down" arrow buttons to change the hour, and make sure that the "AM/PM" indicator is correct. Press the "DAY/TIME" button to advance to the minutes, and then use the "Up" and "Down" arrow buttons to set the minutes. Press the "DAY/TIME" button once again, and then use the "Up" and "Down" arrow buttons to set the correct day of the week. Press the "ENTER" button to exit, saving your changes.

Press and hold the "PROG" button for five seconds to select the five-day span on which the heating or cooling cycle will run.

Use the "Up" and "Down" arrow buttons to change the five-day span that the program will affect. Press the "PROG" button to save your changes.

Press and release the "PROG" button to set the schedule. Use the "Up" and "Down" arrow buttons to change the hour, and then press and release the "PROG" button to advance to the minutes.

Use the "Up" and "Down" arrow buttons to change the minute setting, and then press the "PROG" button to advance to the temperature settings.

Use the "Up" and "Down" arrow buttons to set the desired temperature at the time set.

Press the "PROG" button to advance to the next temperature adjustment period, and then repeat Steps 3 through 7 to set the temperature settings for that period. You may program up to four events per day.

Press the "Enter" button when you are finished to save your settings.